The first thing I do when building any product is go check the latest system requirements in case they have changed. That’s a bit of a challenge with Sametime since the system requirements are (and have been for some time) nonsense. No reference to WebSphere 8.5.5 and definitely no reference to the fixpacks or even the individual servers.
Try it yourself. Go here http://www-01.ibm.com/support/docview.wss?uid=swg27007792 and click on any of the requirements for 9.0.1 Complete, Communicate or Conference to see what I mean.
Buried in the actual help documentation is the phrase “Restriction: Most of the Sametime 9.0.1 servers that run IBM WebSphere® Application Server require version 184.108.40.206” but that doesn’t help anyone wanting detailed system requirements or who doesn’t find that page.
If anyone from the ST or documentation team sees this - please fix it.